51140039 has 4 divisors (see below), whose sum is σ = 53831640. Its totient is φ = 48448440.

The previous prime is 51140009. The next prime is 51140069. The reversal of 51140039 is 93004115.

It is a happy number.

51140039 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (51140009) and next prime (51140069).

It is a cyclic number.

It is not a de Polignac number, because 51140039 - 2¹² = 51135943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51139996 and 51140023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51140009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1345772 + ... + 1345809.

It is an arithmetic number, because the mean of its divisors is an integer number (13457910).

Almost surely, 2^51140039 is an apocalyptic number.

51140039 is a deficient number, since it is larger than the sum of its proper divisors (2691601).

51140039 is a wasteful number, since it uses less digits than its factorization.

51140039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691600.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 51140039 is about 7151.2263983180. The cubic root of 51140039 is about 371.1820946970.

The spelling of 51140039 in words is "fifty-one million, one hundred forty thousand, thirty-nine".